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"a function-definition is not allowed here before ' {' token" (can cause: "'functionName' was not declared in this scope") Usually means you forgot a '}' or put in an extra ' {' in the previous function. Since a set of brackets has not been closed yet the compiler is looking for more code to put in the function.
文章浏览阅读2.9w次，点赞26次，收藏15次。本文探讨了在一个函数体内定义另一个函数的问题，指出这通常是由缺少右大括号引起的，并建议检查函数内的大括号对齐情况。问题往往出现在错误提示前的函数中。
You do not put a ; between the ) after the test in an if or while statement, and the code to execute if the test is true. If/while executes the next statement or block conditionally.
Learn how to resolve the `function-definition is not allowed here before ' {' token` error in Arduino IDE, specifically by understanding function scopes and proper placement of function declarations.
More precisely, you're calling a method of the SofwareSerial library called SoftwareSerial () that needs to attributes, the rxPin (where the Arduino board receives the data) and the txPin (where the Arduino board sends or transmits the data). You can also give an optional value, the inverse_logic boolean.
To make it easier for me to follow I always add the comment at the closing } // End of function xx I sometimes also do it with in the functions especially if I am having problems. I also agree the '}' needs to be on a line by itself, much easier to debug.
Remember, you need to make sure any function you call is 'declared' (or 'declared' + 'defined') (i.e. earlier in the file) before you use it, so these functions would need to come before loop(). Extra Information: Arduino is actually calling your functions setup() and loop() in a main() function (see below).
Of what I can tell all of these errors can be traced to that the "function definition is not allowed". From researching the problem on the internet I have found out that this is usually due to improper indentation.
通过实例说明如何避免此类错误，确保代码的正确性和可读性。 出现错误：a function-definition is not allowed here before ' {' token 解释：不能在一个函数中定义另一个函数 错误原因：main函数 } 误删导致的
在Arduino开发中，当遇到编译 错误 `a function-definition is not allowed here before ' {' token ` 并且存在库冲突（如 `Servo.h` 和 `IRremote.hpp`）时，通常是由代码结构或多个库之间 定义 的符号发生冲突所导致。